Truth is power, even if it doesn't look so in the first place. By being honest, you earn respect from others and yourself. Honesty is what lets you get up each day and be at piece the person in the bathroom mirror, and it's the thing that lets you fall asleep with a smile after a hard days work. Being able to do that sometimes brings envy from others, but, in the long run, has them ask for advice and rely on you.

But anyone who has tried it out can confirm that being a honest person doesn't allow much leeway. Either you're honest, or you're not.

And then, there's the added benefit for a sub, that one often knows in advance that a specific question will be asked and answering truthfully will lead to oh so painfully sweet punishment

Furthermore, of course, a dishonest thrall would certainly not be the friendly, outspoken and charming person we all here have come to love.